Semi-Annual Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                28,069,077,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,148,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,023,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,195,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -4,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                40,377,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,428,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                3,190,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,047,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                20,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                1,604,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,555,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,584,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,524,962,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investments and other assets | 
                                                4,180,289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,152,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,123,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,097,121,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -106,461,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -102,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                8,975,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,755,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                49,353,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,183,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                135,320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                197,708,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                648,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                656,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                1,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,551,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,809,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                23,693,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,378,685,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                6,390,035,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,333,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                9,562,490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,672,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                8,131,126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,233,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                394,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                374,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                496,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                484,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                33,256,285,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,050,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for retirement benefits for directors (and other officers) | 
                                                540,916,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                579,980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                1,095,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,010,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Share capital | 
                                                1,299,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,299,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | ||
| Capital surplus | 
                                                734,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                734,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                14,040,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,084,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -60,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                16,075,508,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,119,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                3,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                21,414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                16,096,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,132,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                49,353,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,183,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |